NCDAP Data Analysis & Statistics 2

Question 1

A number cube (die) is rolled once. What is the probability of rolling a number greater than 4?

Accepted Answer

1/3

Answer

Numbers greater than 4 on a standard die are 5 and 6, which is 2 out of 6 possible outcomes = 2/6 = 1/3.

Question 2

The following scores were recorded: 60, 75, 80, 80, 90, 95. What is the range?

Accepted Answer

35

Answer

Range = maximum − minimum = 95 − 60 = 35.

Question 3

A line graph shows a company's sales increased from $20,000 in 2020 to $30,000 in 2022. What was the percent increase?

Accepted Answer

50%

Answer

Percent increase = (change ÷ original) × 100 = (10,000 ÷ 20,000) × 100 = 50%.

Question 4

Which measure of central tendency is MOST affected by an extreme outlier in a data set?

Accepted Answer

Mean

Answer

The mean uses every value in its calculation, so one extreme outlier can significantly pull it up or down.

Question 5

A bag contains 4 red marbles, 3 blue marbles, and 3 green marbles. If one marble is drawn at random, what is the probability it is blue?

Accepted Answer

3/10

Answer

There are 3 blue marbles out of 4+3+3=10 total marbles, so the probability is 3/10.

(NCDAP) North Carolina Diagnostic Placement Test Practice Test